Mapping with this app is a lot of fun! Sometimes I just go for a walk and open up StreetComplete to see if I can add some small contributions, like the opening hours of some nearby establishment or whether a given entity is still at the location.

You can also customize what kind of questions are shown so you can skip on things you may not like.

I have previously tried selfhosting searX with varying results

I have used mailbox.org before migrating to my own server. Pretty solid.

Pixel 7 for GrapheneOS